flask之pyecharts实时数据更新
我们用falsk来做个小demo 创建app.py 和 templates/index.html and templates/line_on.html
我们先写下前端的 index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Awesome-pyecharts</title>
<script src="https://cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script>
<script type="text/javascript" src="https://assets.pyecharts.org/assets/echarts.min.js"></script>
</head>
<body>
<div id="bar" style="width:500px; height:300px;"></div>
<script>
var chart = echarts.init(document.getElementById(bar), white, {
renderer: canvas});
$(
function () {
fetchData(chart);
setInterval(fetchData, 2000);
}
);
function fetchData() {
$.ajax({
type: "GET",
url: "http://127.0.0.1:5000/barChart",
dataType: json,
success: function (result) {
chart.setOption(result);
}
});
}
</script>
</body>
</html>
定时刷新的核心在于 HTML 的 setInterval 方法。
line_on.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Awesome-pyecharts</title>
<script src="https://cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script>
<script type="text/javascript" src="https://assets.pyecharts.org/assets/echarts.min.js"></script>
</head>
<body>
<div id="bar" style="width:1000px; height:600px;"></div>
<script>
var chart = echarts.init(document.getElementById(bar), white, {
renderer: canvas});
var old_data = [];
$(
function () {
fetchData(chart);
setInterval(getDynamicData, 2000);
}
);
function fetchData() {
$.ajax({
type: "GET",
url: "http://127.0.0.1:5000/lineChart",
dataType: "json",
success: function (result) {
chart.setOption(result);
old_data = chart.getOption().series[0].data;
}
});
}
function getDynamicData() {
$.ajax({
type: "GET",
url: "http://127.0.0.1:5000/lineDynamicData",
dataType: "json",
success: function (result) {
old_data.push([result.name, result.value]);
chart.setOption({
series: [{
data: old_data}]
});
}
});
}
</script>
</body>
</html>
然后是我们的python代码
app.py
ok测试一下